Compare 1620 vs 1621
| Property | 1620 | 1621 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 3 | 1 |
| Total factors | 7 | 1 |
| Prime factorization | 22 × 34 × 51 | 16211 |
| Prime factorization | 2 × 2 × 3 × 3 × 3 × 3 × 5 | 1621 |
| Divisors count | 30 | 2 |
| Divisors | 1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 27, 30, 36, 45, 54, 60, 81, 90, 108, 135, 162, 180, 270, 324, 405, 540, 810, 1620 | 1, 1621 |
| Number of properties | 0 | 8 |
| Chen primes | 163rd | |
| Harmonic primes | 89th | |
| Long primes | 101st | |
| Primes | 257th | |
| Pythagorean primes | 123rd | |
| Sexy primes (1st member) | 111th | |
| Super primes | 55th | |
| Twin primes (2nd member) | 52nd | |
| Roman numberals | MDCXX | MDCXXI |
| Base 2 | 110010101002 | 110010101012 |
| Base 3 | 20200003 | 20200013 |
| Base 4 | 1211104 | 1211114 |
| Base 5 | 224405 | 224415 |
| Base 6 | 113006 | 113016 |
| Base 7 | 45037 | 45047 |
| Base 8 | 31248 | 31258 |
| Base 9 | 22009 | 22019 |
| Base 10 | 162010 | 162110 |
| Base 11 | 124311 | 124411 |
| Base 12 | b3012 | b3112 |
| Base 13 | 97813 | 97913 |
| Base 14 | 83a14 | 83b14 |
| Base 15 | 73015 | 73115 |
| Base 16 | 65416 | 65516 |